Firefox Extended Support Release

We do our best to support Firefox's latest Extended Support Release (ESR). Older versions of Firefox may disable some features on GitHub and require the latest version of Firefox.

Internet Explorer on Windows XP

Because Windows XP is not supported, you see an error message when you try to load GitHub in Internet Explorer. For more information, see "Improving GitHub's SSL setup."

Internet Explorer Outdated Browser Error

We only support IE running in "Standards Mode." If you see an error message about your outdated browser, turn off "Compatibility View."

Beta and developer builds

You may encounter unexpected bugs in beta and developer builds of our supported browsers. If you encounter a bug on GitHub in one of these unreleased builds, please verify that it also exists in the stable version of the same browser. If the bug only exists in the unstable version, consider reporting the bug to the browser developer.